Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via BTC Prediction) Pick polygram.ink (preferred broker) |
100% | 0% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Open live market → |
Polymarket (direct) polymarket.com |
100% | 0% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | Open live market → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | Open live market → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | Open live market → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | Open live market → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| Grodzisk Mazowiecki: Ivan Marrero vs Maks Kasnikowski | 100% |
| Completed Match | 100% |
| Grodzisk Mazowiecki: Ivan Marrero vs Maks Kasnikowski Total Sets: O/U 2.5 | 100% |
| Grodzisk Mazowiecki: Ivan Marrero vs Maks Kasnikowski Set 2 Winner | 100% |
| Grodzisk Mazowiecki: Ivan Marrero vs Maks Kasnikowski Match O/U 21.5 | 100% |
| Grodzisk Mazowiecki: Ivan Marrero vs Maks Kasnikowski Set 2 O/U 8.5 | 100% |
| Grodzisk Mazowiecki: Ivan Marrero vs Maks Kasnikowski Match O/U 22.5 | 100% |
| Grodzisk Mazowiecki: Ivan Marrero vs Maks Kasnikowski Set 2 O/U 9.5 | 100% |
| Grodzisk Mazowiecki: Ivan Marrero vs Maks Kasnikowski Match O/U 23.5 | 100% |
| Grodzisk Mazowiecki: Ivan Marrero vs Maks Kasnikowski Set 2 O/U 10.5 | 100% |
| Grodzisk Mazowiecki: Ivan Marrero vs Maks Kasnikowski Set 1 Winner | 0% |
| Grodzisk Mazowiecki: Ivan Marrero vs Maks Kasnikowski Set 1 O/U 8.5 | 0% |
| Grodzisk Mazowiecki: Ivan Marrero vs Maks Kasnikowski Set Handicap +/-1.5 | 0% |
| Grodzisk Mazowiecki: Ivan Marrero vs Maks Kasnikowski Set 1 O/U 9.5 | 0% |
| Grodzisk Mazowiecki: Ivan Marrero vs Maks Kasnikowski Set Handicap +/-1.5 | 0% |
| Grodzisk Mazowiecki: Ivan Marrero vs Maks Kasnikowski Set 1 O/U 10.5 | 0% |
Market context
Maks Kasnikowski’s on-court position looks stronger than the 74% implied by the market, but not enough to make the favourite label trivial. He is listed well ahead of Ivan Marrero Curbelo on the ATP rankings in the live match data, with Kasnikowski around the low 230s and Marrero around the mid-350s, and several pre-match feeds framed the Pole as the expected winner on outdoor hard courts in Grodzisk Mazowiecki.[3][5][15] That aligns with the market’s bias towards a straight-through advance rather than a long, volatile contest, which matters because this contract settles only on the player who actually advances, not on set score or margin.[2][12]
For traders, the main catalyst is whether the match remains on the published Challenger schedule and completes inside the settlement window, because a cancellation, tie, or delay beyond seven days would force a 50-50 resolution under the contract rules.[2] Live score services show the fixture as a round-of-16 match in Grodzisk Mazowiecki on the outdoor hard-court centre court, but the listed start times vary across feeds, which is a reminder that official order-of-play updates and court assignments can move within the day.[1][3][7] In a crypto context, the payout is USDC-settled on-chain, so the market’s value mainly tracks event risk rather than BTC or ETH direction; broad crypto moves only matter indirectly if they shift venue liquidity, collateral preference, or trader risk appetite around the expiry window.
Methodology
This page reads Grodzisk Mazowiecki: Ivan Marrero vs Maks Kasnikowski on-chain. Polymarket's quote comes directly from the Polygon order book — the only comparable venue with on-chain settlement. Kalshi (USD, off-chain), Betfair (GBP/EUR, off-chain) and Manifold (play-money) are listed alongside for venue context. Every CTA routes to BTC Prediction, which mirrors the Polymarket order book directly.
Resolution & payout
Settlement is on-chain via UMA Optimistic Oracle. A proposer posts the outcome with a bond, a two-hour dispute window opens, then the smart contract lifts winning conditional tokens to 1 USDC and sends payments to holders' wallets automatically. No withdrawal fees beyond Polygon gas.
Off-chain venues (Kalshi, Betfair, Smarkets) settle in local fiat through bank-side clearing — faster than SWIFT, slower than on-chain. Manifold pays no real cash.
UK Frequently Asked Questions
- What are crypto prediction markets?
- Crypto prediction markets are on-chain smart contracts where you buy YES or NO shares on a future crypto event (e.g. "BTC above $100k by year-end"). The market price between 0¢ and 100¢ is the implied probability.
- What does a transaction cost on Polygon?
- Polygon gas is typically under $0.01 per transaction. A full trade cycle (Approve + Order + Fill) totals around $0.03 — compared to $5-50 on Ethereum mainnet.
- Is Polymarket legal in the UK?
- Polymarket is accessible to UK traders but is not UKGC-licensed. It operates under US CFTC jurisdiction. UK residents face no domestic legal prohibition on using it, but UKGC consumer protections do not apply. For UKGC-regulated alternatives, Betfair Exchange and Smarkets offer similar prediction-style markets.
- Do I pay tax on prediction market profits in the UK?
- UKGC-licensed platform profits (Betfair, Smarkets) are typically tax-free gambling winnings for UK individuals. Polymarket profits involve USDC crypto transactions, which HMRC treats as Capital Gains Tax events. Keep full transaction records and report via Self Assessment if gains exceed £3,000 per tax year.
- How do I deposit on Polymarket from the UK?
- UK traders typically fund Polymarket via Coinbase UK, Kraken or Revolut — buying USDC with GBP and transferring to a Polygon-compatible wallet (MetaMask, Coinbase Wallet). Polymarket's onboarding walks you through the bridging process. Typical GBP-to-USDC conversion costs 0.5–1%.
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